package com.wolfking.back.core.util;

public class PasswordUtil {

	public static final String HASH_ALGORITHM = "SHA-1";
	public static final int HASH_INTERATIONS = 1024;
	public static final int SALT_SIZE = 8;
	/**
	 * 生成安全的密码，生成随机的16位salt并经过1024次 sha-1 hash
	 */
	public static String entryptPassword(String plainPassword) {
		String plain = Encodes.unescapeHtml(plainPassword);
		byte[] salt = Digests.generateSalt(SALT_SIZE);
		byte[] hashPassword = Digests.sha1(plain.getBytes(), salt, HASH_INTERATIONS);
		return Encodes.encodeHex(salt) + Encodes.encodeHex(hashPassword);
	}

	/**
	 * 验证密码
	 *
	 * @param plainPassword 明文密码
	 * @param password      密文密码
	 * @return 验证成功返回true
	 */
	public static boolean validatePassword(String plainPassword, String password) {
		String plain = Encodes.unescapeHtml(plainPassword);
		byte[] salt = Encodes.decodeHex(password.substring(0, 16));
		byte[] hashPassword = Digests.sha1(plain.getBytes(), salt, HASH_INTERATIONS);
		return password.equals(Encodes.encodeHex(salt) + Encodes.encodeHex(hashPassword));
	}
}
